Samsung S5PC100 User Manual page 235

Power Management
7.5 WAKEUP RESET
Wakeup reset is asserted when a module that has normal F/Fs is powered down, and the module is powered up
again by wakeup events. Note that if the module has only retention F/Fs, wakeup reset is not asserted. But in
sleep mode, wakeup reset is generated to all modules that were powered off regardless of normal F/F or retention
F/F.
Therefore, wakeup reset is asserted in NORMAL, DEEP-IDLE, DEEP-STOP, and SLEEP mode.
In NORMAL mode, if a sub-domain is powered down, and the sub-domain is powered up again, wakeup reset is
asserted to the sub-domain.
In DEEP-IDLE and DEEP-STOP mode, wakeup reset is asserted to Cortex-A8, since Cortex-A8 is powered up
again when wakeup event occurs in these power modes. Wakeup reset is also asserted to a top domain if it was
power-off (i.e., SFR_PWR_CFG[30] = 1'b0 for DEEP-IDLE mode / SFR_STOP_CFG[8] = 1'b0), and a sub-domain
that becomes power on after exiting from DEEP-IDLE and DEEP-STOP mode.
Finally, wakeup reset is asserted when the system is waked up from sleep mode by wakeup event.
The exact timing diagram for wakeup reset is shown in Figure 2.4-11 for DEEP-IDLE mode (top domain off),
Figure 2.4-14 for DEEP-STOP mode (top domain off), and Figure 2.4-15 for SLEEP mode.
In these cases, XnRSTOUT is asserted when SFR_OTHER [1:0] field is set to 2'b10.
Register initialization due to various resets, is shown in Table 2.4-15.
Block
PMU
PMU
PMU
RTC_AHBIF
2.4-36
Table 2.4-15 Register Initialization Due to Various Resets
Wakeup from SLEEP, DEEP IDLE(Top Off),
RST_STAT
(1)
INFORM4-7
PWR_CFG, EINT_WAKEUP_MASK, NORMAL_CFG,
STOP_CFG, SLEEP_CFG, OSC_FREQ, OSC_STABLE,
PWR_STABLE, INTERNAL_PWR_STABLE,
CLAMP_STABLE, OTHERS, WAKEUP_STAT,
BLK_PWR_STAT, INFORM0-3, DCGIDX_MAP0-2,
DCGPERF_MAP0-1, DVCIDX_MAP, FREQ_CPU,
FREQ_DPM, APLL_CON_L1-8, CLKDIV_IEM_L1-8,
IEM_HPMCLK_DIV, IEM_CONTROL
RTCCON, TICCNT, RTCALM, ALMSEC, ALMMIN,
ALMHOUR, ALMDAY, ALMMON, ALMYEAR, RTCRST
Hardware (XnRESET)
Watchdog
DEEP STOP(Top Off)
Registers
S5PC100 USER'S MANUAL (REV1.0)
Software
X X
X X
X X
X X
X O
X X
O O
O O